The wave equation
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Pythagoras and Euclid were best known for their work in mathematics.
undecagon has 43 diagonals (answer by erwin handsome)
Pythagoras was well known for the Pythagorean Theorem.
Robert Arnott Wilson is best known for his work on classifying the maximal subgroups of finite simple groups and for the work in the Monster group.
The best known CPI is the Consumer Price Index and that cannot be negative.